Hi all! Once i spent exeperimental with compression, but the main problem has been data storage and I also saw archivers. About the compression:
-At the same coefficient image compression format ECW is more granular and compressed in a format SID is more blur;
- Used in the algorithm GlobalMapper ECW identical to the other, but sometimes poorly taken up by the projection of the source file.
- J2000 uses the same wavelet transform, but at the same compression ratios, ECW and SID compressed visually with smaller losses than in J2K.
- At the same values of the coefficients of compression, compression sid in fact better than ecw. J2000 format compresses the worst of all, and spoils the picture in the Erdas, ENVI algorithm is implemented better, but will choose a total of 2 compression versions - high and low.
Original image:
Format – img (Erdas Imagine)
Size - 3 406 825 203 byte
Compression - no
Mode - Panchromatic
Bits/pix – 8
Calculations are stated in Table
http://postimage.org/image/5q0bai1up/